What's this?

[steo123]

What's this white stuff growing on my live rock?

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[billdogg]

My guess is an encrusting sponge. Is it hard or firm but a bit squishy ?

 

[mcgyvr]

Yep.. Sponge.

 

[steo123]

Good or bad?

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[steo123]

It used to be purple now it's going white

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[Cedjeffski]

Sometimes my Coraline will die off like that, I have a few spots like that due to calcium levels changing and or flow rates changing in certain areas.


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[Cedjeffski]

That's just a guess though, hard to tell from just a picture... but if it was purple I know it's white, that would be my guess.


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[mcgyvr]

It used to be purple now it's going white

Well.. now based on that its likely a type of coralline algae..
Its harmless

 

[Uncle99]

If it was purple, maybe a dead purple sponge?
Sponge is a good, most consume silicates in the water column to build their structures.

 

[saltpeter]

Do you have urchins? My 2 hitch hiker urchins have started munching the purple off my rocks.